[libvirt] [PATCH] qemu: check if domain is really active when do setvcpus with --live

[Luyao Huang]

https://bugzilla.redhat.com/show_bug.cgi?id=1204006

Commit e105dc9 fix setting vcpus for offline domain, but forget check
if vm is active when pass VIR_DOMAIN_AFFECT_LIVE flags.

 # virsh setvcpus test3 4 --live
 error: Failed to create controller cpu for group: No such file or directory

add a check if we pass VIR_DOMAIN_AFFECT_LIVE flags.

Signed-off-by: Luyao Huang <lhuang at redhat.com>
---
 src/qemu/qemu_driver.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 6d9217b..40d2776 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -4888,6 +4888,12 @@ qemuDomainSetVcpusFlags(virDomainPtr dom, unsigned int nvcpus,
         goto cleanup;
 
     if (flags & VIR_DOMAIN_AFFECT_LIVE && !(flags & VIR_DOMAIN_VCPU_GUEST)) {
+        if (!virDomainObjIsActive(vm)) {
+            virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+                           _("domain is not running"));
+            goto endjob;
+        }
+
         if (virCgroupNewEmulator(priv->cgroup, false, &cgroup_temp) < 0)
             goto endjob;
 
-- 
1.8.3.1